PlatformIO is an advanced and extremely versatile ecosystem for IoT development that includes an IDE, build system, unified debugger and library manager. It comes with support for more than 400+ development boards, 20+ development platforms and over 10+ useful frameworks. The PlatformIO IDE is a cross-platform utility for rapid professional development with built-in C/C++ Intelligent Code Completion, Smart Code Linter and advanced Serial Port monitor. Also, PlatformIO can be integrated with the popular IDEs and continuous integration systems to speed up time to delivering IoT applications. PlatformIO is a comprehensive ecosystem that provides an excellent opportunity to explore the fascinating world of IoT development.